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Describe one similarity and one difference between the structures of diamond and graphite.

Answer:Similarity: either: both contain carbon atoms ; or: both have strong covalent bonds between the atoms Difference: either: graphite structure has layers whereas diamond structure does not ; or: graphit...
TD
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A right-angled triangle has perpendicular sides of length 6cm and 8cm, and a hypoteneuse of 2y cm. Find the length of y.

By Pythagoras' Theorem:(2y) 2 = 6 2 + 8 2 4y 2 = 36 +64y 2 = 9 + 16y 2 = 25y = ±5However, dimensions can only have a positive value. Therefore y=5
ES
Answered by Emmanuel S. • Maths tutor
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Solve the simultaneous equations to find x and y: 3y - x = 12 y + 2x = -3

3y - x = 12 (1)y + 2x = -3 (2)multiply equation (2) by 3: 3y + 6x = -9 (3)subtract equation (1) from equation (3): 3y + 6x - 3y + x = -9 -12 7x = -21 x = -3substitute x into equation (2): y -6 = -3 y = 3answ...
CG
Answered by Chloe G. • Maths tutor
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I have £300 I want to split between my daughters Megan, Danni and laura in the ratio 3:4:1 respectively. How much money will Danni get?

Firstly, we need to add up how many 'parts' this money is being split into by adding the ratio, 3+4+1 = 8 parts. Now we need to calculate how much one part is equal to by splitting our £300 into the 8 parts....
HM
Answered by Holly M. • Maths tutor
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Expand the following quadratic expression: (2x+4)(x-5)

Multiply the first terms in both brackets:2x x= 2x 2 Next multiply the first term of the first bracket and the second term of the second bracket:2x -5= -10x Multiply the second term of the first bracket with...
MP
Answered by Meera P. • Maths tutor
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